SATISH CHANDER SG W BIDIRECTIONAL VISITOR COUNTER of each 7-segment display are connected to port P2 of the microcontroller AT89C51 . IS P L A Y CODING: // Program to make a bidirectional visitor counter using IR . Mini Project Report On Digital Visitor counter using Microcontroller . ROOM APPLIANCE CONTROL WITH BIDIRECTIONAL VISITOR COUNTER. This is a simple circuit diagram of bidirectional visitor counter using microcontroller which helps to count the number of people entering or leaving a room.

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Capacitors of suitable values can be connected at input and output pins depending upon the respective voltage levels.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

Thus the relay becomes de-energized and thus in off position. For the erasable variants, quartz was required, instead of less expensive glass, for its transparency to ultraviolet—glass is largely opaque to UV—but the main cost differentiator was uding ceramic package itself. Something is simply being written into or read from it, and it could be noticed on the pins of the microcontroller. A seven segment is generally available in ten pin package. Thus the upper contact arm starts to be attracted to the lower fixed arm and thus closes the contacts causing bidircetional short circuit for the power to the load.

Whenever an interruption is observed by the first IR sensorit increments the counter value. There is a related line of 79xx devices which are complementary negative voltage regulators. External interrupt for vvisitor 0.


An ideal capacitor is characterized by a single constant value, capacitance, which is measured in farads. Whether they are input or output is set in the software. This is important in any application where anything to do with time or exact measurement is crucial.

Bit Memory Thebeing a communication oriented microcontroller, gives the user the ability to access a number of bit variables. The figure is as shown below: This is true even in the day time at some places like conference halls or offices where a good brightness levels are desired. As mentions in the circuit diagram we connect it to the appropriate space.

The majority of microcontrollers in use today are embedded in other machinery, such as automobiles, telephones, appliances, and peripherals for computer systems.

Microcontroller (AT89C51) based Digital Visitor Counter Project

The similar discussion applies to the electron current in the n-region. Enter the email address you signed up with and we’ll email you a reset link. NP0 refers to the shape of the capacitor’s temperature coefficient graph how 80051 the capacitance changes with temperature.

Help Center Find new research papers in: By modifying this circuit and using two relays we budirectional achieve a task of opening and closing the door. For low voltage applications, more preference will be given to reduce the noise of the whole circuit. Hitachinow discontinued. The peak to peak is not affected by clamping.

I am built this dc regular circuit, is the first project. The data register stores the data to be displayed on the LCD. This allows a part to be used in a wider variety of applications than if pins had dedicated functions. This Code is only visible to Registered users. Simply put, a phototransistor amplifies variations in coujter light striking it.


When the relay is deactivated, the circuit connects. See also the mapping between Arduino pins and ATmega ports. Also known as binary, the Arduino sends these 1s and 0s bits one by one, or Serially. This block is responsible for converting an information about some analog value to a binary number and for follow it through to a CPU block so that CPU block can further process it.

Maximum is 2, bytes.

The voltage regulator IC maintains the output voltage at a constant value. Microcontrollers typically do not have a math coprocessor, so floating point arithmetic is performed by software. Simplified central processing unit with three registers Registers are therefore memory locations whose role is to help with performing various mathematical operations or any other operations with data wherever data can be found.

Janardhana Raju, Dean School of Engineering for providing us by means of attaining my cherished goals. Other characteristics include temperature coefficient, noise, and inductance.

These diodes are obsolete. These types of sensors measure only infrared radiation, rather than emitting it that is called as a passive IR sensor.

Connect the outer two terminals of the potentiometer to 5V and ground, and the middle terminal to pin 3 of LCD.